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A quadcopter, also called quadrocopter, or quadrotor [1] is a type of helicopter or multicopter that has four rotors. [ 2 ] Although quadrotor helicopters and convertiplanes have long been flown experimentally, the configuration remained a curiosity until the arrival of the modern unmanned aerial vehicle or drone.
The Eurocopter X³ (X-Cubed) is a retired experimental high-speed compound helicopter developed by Airbus Helicopters (formerly Eurocopter).A technology demonstration platform for "high-speed, long-range hybrid helicopter" or H³ concept, [1] the X³ achieved 255 knots (472 km/h; 293 mph) in level flight on 7 June 2013, setting an unofficial helicopter speed record.
Other modern stellar classification systems, such as the UBV system, are based on color indices—the measured differences in three or more color magnitudes. [2] Those numbers are given labels such as "U−V" or "B−V", which represent the colors passed by two standard filters (e.g. U ltraviolet, B lue and V isual).
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Original helicopter "classes" were based on the engine size. For example, a helicopter with a 0.30 cu in (4.9 cm 3) engine was a 30 class and a helicopter with a 0.90 cu in (14.7 cm 3) engine was referred to as a 90 class helicopter. The bigger and more powerful the engine, the larger the main rotor blade that it can turn and hence the bigger ...
The primary differences between the Mini 3 and Mini 3 Pro include the removal of the obstacle avoidance sensors and limited intelligent camera modes. [ 21 ] [ 22 ] The transmission system was also downgraded to OcuSync 2.0 instead of the O3 used in the DJI Mini 3 Pro. [ 20 ]
[9] Hexacopter. [10] In order to allow more power and stability at reduced weight, coaxial rotors can be employed, in which each arm has two motors, running in opposite directions which cancels out rotational torque (one facing up and one facing down). [11]
It has a conventional helicopter configuration, with a three-bladed main rotor with a diameter of 7.2 meters (24 feet), an enclosed "fenestron" tail rotor favored by the French, and landing skips. There is a sensor turret under the nose and an antenna or sensor drum under the belly between the landing skids.